Radio receiving set



July 7, 1931. A. A. BESTE RADIO RECEIVING SET Filed May 6, 1927 gwuwntoz yaw Patented July 7, 1931 AUGUST A. BESTE, F VIRGINIA, MINNESOTA RADIO RECEIVING SET Application filed May 6, 1927. Serial No. 189,208.

This invention relates to radio receiving apparatus generally, and more particularly to a novel means for effectively increasing and otherwise improving the selectivity of such apparatus, as well as the tuning and volume characteristics and qualities thereof.

The principal object is to provide a comparatively simple means of this type which is preferably in the form of an attachment or separate unit adapted to be readily connected to an otherwise complete radio receiving set and thereby materially improve the reception, both with regard to selectivity and volume, the-embodiment of which,

515 to be hereinafter more fully described and as illustrated, by way of example, being particularly adapted for use on a set designed for the reception of wave lengths ranging from approximately 180 to 600 .20 meters.

With the foregoing and other equally important objects and advantages in view, the invention resides in the certain new and useful combination, construction and arrangement of parts and circuits as will be hereinafter more fully described, set forth in the appended claims, and illustrated in the accompanying drawings in which:

Figure 1 is a wiring diagram embodying the invention; and

Figure 2 is a perspective view of one of my completely assembled units.

Figure 3 illustrates my invention as applied to the cabinet of a radio receiving set. Referring to the drawings, wherein similar characters of reference designate corresponding parts throughout the several views thereof, the practical embodiment of the invention, as shown therein, comprises a receptacle of any desired form, preferably a suitable box and in which is mounted in any desired manner, as for example, a 3 inch form 2 carrying a plurality of groups or coils made from #18 to #24 D. C. C. wire. One group or coil, indicated at 3, comprises preferably 130 turns of the wire, the terminals or taps of which are shown at 4 and 5. The second group or coil is shown at 6, and comprises, for instance, 44 turns of the wire with its taps shown at 7 and 8,

while the third group is indicated at 9 and 7 comprises, say, by way of example, 16 turns with taps 10 and 11.

v A switch board or block 12 is preferably mounted upon the cover or side of the coil box 1, and, if preferred the coils 3, 6 and 9 may also be carried upon the under side of the cover for convenience in accessibility.

The switches 13 and 14 are preferably of the common double pole type, wherein the movable members or blades thereof are p'ivotally mounted upon the block 12, the former being selectively eng-ageable with either the contacts 15 and 16 or the contacts 17 and 18, and the latter with the contacts 17 and 18 or the contacts 19 and 20.

In the preferred hook-up the contacts 19 and 20 are connected with the taps 10 and 11 of the smallest coil 9, which, when closed, will produce most satisfactory results on wave length ranging approximately from 180 to 278 meters. v

The contacts 17 and 18 are connected to the taps 4 and 5 of the largest coil 3 and when closed in the circuit gives best results on wave lengths ranging from approximately 280 to 416 meters, and this connection it will be noted may be accomplished either by the switch 13 or 14 as desired.

The contacts 15 and 16 are connected to the taps 7 and 8 of the intermediate coil '6 and when closed by the switch 13 gives best results on wave lengths ranging from'416 to 600 meters.

With this novel arrangement of switches it will beseen'that the following combinations of coils maybe made for still further variation in tuning; 3 plus '6, or 3 plus '9.

21 represents the antenna lead-in, 22 the receiving set, and 23 the ground wire from the set.

Conductors 24 and 25, preferably in the form of an insulated cable 26 (Figure 2) are each commonly connected to the oppositely disposed pivot connections of the switches 13' and 14, and in use, the free end of the conductor 13 is to be electrically connected to the lead-in conductor of the antenna 21, and the similar end of the conductor 25 to the lead-in of the ground 0011- 100 ductor 23, or vice versa, whereby the attachment or unit will be disposed in shunt with respect to the receiving set 22.

The attachment or auxiliary unit, as thus constructed and arranged, is to be electrically connected to the external portion of the primary circuit of the receiving set as formed by the antenna lead in 21 and the ground wire 23, at any convenient point in proximity to the terminals of the latter of the two lead-ins therewith, or the same may be detachably connected directly to the usual antenna and ground binding posts on the receiving set.

Of course, it is to be understood that the several coils or coil sections 3, 6 and 9 may be incorporated within the usual cabinet of known radio receiving sets, and the control switches 13 and 14 thereof located at a convenient point exteriorly of the cabinet; in which case the receiving set will normally operate whenever the switches 13 and 1e are disposed in open circuited positions. By this arrangement, the auxiliary tuning coils may be held in reserve until such time as the normal reception of the set warrants the employment of the latter. Here, the switches 13 and M will, upon manipulation, switch into the primary circuit any one of the several coils or coil sections, or any combination thereof which will produce the best results in the reception after the proper C01l or combination of coils has been determined upon.

Without further description, it is thought that the features andadvantages of the invention will be readily apparent to those skilled in the art, and it will of course be understood that changes in the form, proportion and minor details of construction may be resorted to, without departing from the spirit'of the invention or its scope as claimed.

Having thus described my invention, what I claim and desire to secure by Letters Patent, is:

1. An auxiliary tuning device for radio receiving apparatus comprising a closed receptacle having a hinged cover, aplurality of separate differentiating coils disposed within said receptacle, a double pole, double throw switch mounted on said cover and connected to certain of said coils, a double pole, single throw switch also mounted on said cover and connected to the other of said coils, said switches being arranged in end to end abuttingrelation, whereby the blades of the last-named of said switches will be engageable with the adjacent of the contacts of the first-named of said switches, and conductors commonly connected to said switches and leading therefrom for connection with the primary circuit of a receiving apparatus.

. 2. The combination with a radio receiving apparatus, of an auxiliary tuning unit comprising a plurality of separate differentiating coils disposed within the usual cabinet of such apparatus, a double pole, double throw switch mounted exteriorly of said cabinet and connected to certain of said coils, a double pole, single throw switch also mounted exteriorly of the said cabinet and connected to the other of said coils, said switches being arranged in end to end abutting relation, whereby the blades of the last named ofsaid switches will be engageable with the adjacent of the contacts of the first named of said switches, and conductors commonly connected to said switching devices and leading therefrom for connection to the usual antenna and ground contacts of the said apparatus.

3. An auxiliary tuning device for radio receiving appartus comprising a closed receptacle having a hinged cover, a plurality of separate differentiating coils disposed within said receptacle, a switch mounted on said receptacle and connected to certain of said coils, a second switch mounted on said receptacle and connected to the other of said coils, said switches being adapted to cooperate one with the other whereby the several coils may be variably connected in circuit, and a conductor commonly connected to said switches and leading therefrom for connection with the primary circuit of a receiving apparatus.

In testimony whereof I affix my signature.

AUGUST A. BESTE. 

